The tire studs and chains that are popular with Pacific Northwest drivers carve troughs into concrete. A regional contractor and Washington State pavement engineers are watching how fast-setting, ultrahigh-strength Rapid Set® UHPC Mortar stands up to traffic.
Broken continuous reinforced concrete pavement (CRCP) panels were replaced using Rapid Set Cement and local aggregates. The repaired pavement reached a flexural strength of 400 psi in four hours and reopened to traffic by 6:30 am each day.
Rapid Strength Concrete (RSC) slabs on six California jointed plain concrete pavement (JPCP) highway projects were surveyed. The overall performance of the RSC slabs were similar and considered to be outstanding over 13 years.
Rapid Strength Concrete (RSC) slabs on six California jointed plain concrete pavement (JPCP) highway projects were surveyed. The overall performance of the RSC slabs were similar and considered to be outstanding over 13 years.
Work was performed in temperatures of 18° to 49° degrees Fahrenheit. The high early strengths of DOT Cement allowed the concrete to be exposed to freezing temperatures unlike portland cement concrete.
The I-64/40 pavement patching project consisted of replacing 7,500 square yards of 11-inch-thick concrete panels. Work was completed ahead of schedule using Rapid Set Cement.
To ensure all timelines and incentives could be met, Rapid Set Cement and DOT Repair Mix Concentrate (aka DOT Concentrate) were used for all patching and doweling work. Work included full-depth panel replacements and slot stitching at longitudinal cracks and joints and DBR at transverse cracks and joints using DOT Concentrate.
UDOT Region 4 was very pleased with the State Street project because Rapid Set Cement allowed short closure times, minimizing the project’s impact on the traveling public.
The North Carolina Department of Transportation (NCDOT) has used concrete mix designs containing Rapid Set Cement since 2014 to meet performance specifications for their roadway panel replacement projects. Here, the contractor was able to meet the required reopening strength before 6:30 am every day in every season.
Because the roadway had to be returned to traffic by a specified time with a minimum compressive strength of 1,600 psi, Rapid Set Cement’s fast curing time was the ideal solution. The contractor was able to use the closure times efficiently to replace more panels each weekend.
When the highway has to be repaired and reopened by 6 a.m. and the pavement has to have 3000 psi compressive strength to reopen, the Washington State DOT (WSDOT) often specifies Rapid Set Cement. Contractors working for the agency placed 200 tons over three months to restore a smooth ride for commuters.
Engineering firms URS and Stantec received an Honor Award for their innovative way of designing pavement with minimal joints, no curling, no cracking, and no spalling. Komponent shrinkage-compensating concrete was used for the skid pad.
After removing the concrete around the manholes, the collars were reset to the correct elevations using Concrete Mix. SET Control was used when temperatures rose. With no delays, crews met the construction schedule.
TxDOT used Concrete Mix and Mortar Mix to repair 180 miles of spalled, cracked concrete roadway. Part of the project took place in extreme temperatures ranging as from 95 to 109 degrees Fahrenheit. The products met the state of Texas' specifications and requirements.
Approximately 7 to 8 miles of freeway needed potholes repaired. Concrete Mix was chosen for its high early strength so repairs could be made overnight. The lanes were successfully open for traffic each morning.
Copings at train station were repaired to provide a safe surface for embarking/disembarking passengers. Work was performed during hot weather with temperatures reaching 95 degrees Fahrenheit. Cement All and SET Control were used.
Salt Lake City’s micro-trenching work occurred when Utah was still experiencing winter weather. Flowable Fill flowed well into the trench’s small space and set up quickly despite the cold weather, achieving the specified requirement of 500 psi in 28 days, with half the maximum strength at opening, which was a few hours.
The Utah DOT uses bulk Rapid Set Cement on time-sensitive projects to minimize inconvenience to the driving public. Contractor Dry Creek Structures consistently met the 6 am reopening deadline and 4000 psi (compressive) reopening strength. Demolition, installation, and curing of the newly placed concrete was completed in time for the morning commute.
Portions of two busy interstates had to patched overnight and reopened to traffic by 5 am. Using Rapid Set Cement, contractor RA Knapp Construction was able to get 2.3 times the production in the same eight-hour time frame. The Kansas DOT has added Rapid Set to its patching specifications.
The NCDOT oversaw the full-depth panel replacement on the southern stretch of Interstate-40 in Raleigh, North Carolina. Rapid Set cement concrete was used and met the specifications of 400-psi flexural strength in two hours, in half the time.
Unlike the chemically stabilized air bubble of traditional methods, Low-P MSA's air voids are made up of tiny, flexible hollow polymer spheres that act as microscopic forms in the cement matrix. They are rigid enough to form voids in the hardened concrete, yet soft enough to compress and allow space for expanding water to provide the desired freeze/thaw protection.
Work was able to be performed overnight and lanes reopened to traffic by morning. 12,000 spall repairs and dowel bar retrofits were completed using DOT Repair Mix.
300 cubic yards of concrete were successful placed in 6 hours. The freeway opened to traffic an hour after placement. Short Load produced the Rapid Set Concrete.
Volumetric Mixer produces 398 cubic yards of rapid strength concrete in just 5 hours, for panel replacement work on one of California's busiest freeways. Product used was Rapid Set Cement.
